Using lava rock screened (to remove large pieces and also dust) as mulch
will not only keep weeds down due to the shading of the ground (most
weed seeds need light to germinate) it also retains moisture in the
shaded soil beneath it.

Larger pieces are used in barbeques and the biggest pieces as focal points or drilled out to use as planters like the gift from the volcano.

A little realized benefit to mulching
with lava rock is that due to the formation of the rock deep under
ground, minerals and micro nutrients are present that slowly leach out
in minute quantities to feed the plants.

Tests show that micro nutrients even in these tiny amounts are
enough to give many drought tolerant plants all the food they need.

Interestingly, lava rock can be used to filter water.

Running water either in a waterfall in your pond, where the water is continually filtered to remove algae, or to remove debris from rain water captured from a roof.

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